named-slots.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bulma/0.7.2/css/bulma.css">    
    <title>Document</title>
</head>
<body>
    
    <div id="root" class="container">
        <modal>
            <template slot="header">My header title</template>

            Here is my main content.
            
            <div slot="footer">
                <button class="button is-success">Save changes</button>
                <button class="button">Cancel</button>
            </div>

        </modal>
    </div>

    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script src="js/named-slots.js"></script>

</body>
</html>